Brush-holder



(N0 Model H BLADES.

BRUSH HOLDER.

No. 451,909. Patented May 12,1891.

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UNITED STATES PATENT OFFICE.

HARRY II. BLADES, OF DETROIT, MICHIGAN.

BRUSH-HOLDER.

SPECIFICATION forming part of Letters Patent No. 451,909, dated May 12,1891.

Application filed August 14, 1890. Serial No. 361,991. (No model.)

To all whom it may concern.-

Be it known that I, HARRY H. BLADES, a citizen of the United States,residing at Detroit, county of "Wayne, State of Michigan, have inventeda certain new and useful Improvement in Brush-Holders; and I declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it pertains tomake and use the same, reference being had to the accompanying drawings,which form a part of this specification.

Heretofore in the use of motors, dynamos,

&c., it has been necessary, when it was desired to change the directionof the revolution of the armature, to reverse the position of thebrush-holders by removing them from their supporting shaft orspindle'and placing them on again in their reversed or proper position;but to a person unfamiliar with this work this is somewhat difficult andis not always properly done, and it is the object of my invention toproduce a brush-holder and its tension mechanism whereby the position ofthe holder with respect to the commutator may be reversed withoutremoving any of the parts from the supporting shaft or spindle.

The invention also contemplates other novel features of constructionhereinafter explained.

In the drawings, Figure l is a vertical section through a commutator andthe brushholder and supporting mechanism. Fig. 2 illustrates the samereversed. Fig. 3 illustrates a variation.

In carrying out my invention,A represents the commutator. On the shaftsor spindles B B, which are supported by the usual rocker-arm, aresupported the brush-holders D. Each holder has two lugs d, which embracethe shaft B, while the holderis provided with the transverse slot oropening (1, in which the brush is held by the set-screw (P. On the shaftB and between the lugs d is the collar E. This collar is provided withthe tapering threaded lug e, and the collar is split through this lug,as at e. Engaged to the collar by a suitable set-screw at a pointsubstantially opposite to the lug is the spring F. This may be aleaf-spring of a single ply, as shown, or two or more plies may be used.The spring is engaged substantially at its middle, so that both endsshall project out free; or, if desired, instead of a single springengaged atits middle, the equivalent thereof might be used, as shown inFig. 3,in which two springs are used with their free ends projecting inopposite directions.

Gr is a suitable handle provided with a tapering threaded socket g tolit the threaded exterior of the lug e. As will be seen, by un screwingthe socket from the log the collar, being split, will be sufficientlyrelieved from its grasp on the shaft to be revolved to the desiredextent, and then by screwing up the socket the collar will be tightenedon the shaft and be held in place.

The operation of the apparatus is as follows: The spring F is employedto exert a tension on the brush-holder. Now, supposingitis desired toreverse the position of the holder, the operator need simply loosen thehandle G with its socket. The collar Ecan then be revolved until theopposite end of the spring from that which had been previously usedcomes to a bearing on the holder D. A continued revolution of the collarthen throws the holder D around into its reversed position, as shown inFig. 2. The brush can then be adjusted properly, either by removing itand reversing it or by adjusting the reverse end properly. The collar isthen tightened again and the motor started in the opposite direction.Thus without the removal of any of the parts from the supporting-shaftthe position of the brushholder has been reversed.

\Vhat I claim is-- l. The combination, with a brush-holder and itssupporting-shaft, of aleaf-spring having both ends free and supported onsaid shaft independent of the holder, one free end of the spring adaptedto bear on one side of the holder and the other free end 011 the otherside, substantially as described.

2. The combination, with a commutatorbrush holder and itssupporting-shaft, of the collar journaled on said shaft below theholder, and the spring F, engaged to the collar and having its free endsprojecting in each direction, whereby a spring-pressure may be exertedon either side of the holder, substantially as described.

In testimony whereof I sign this specification in the presence of twowitnesses.

HARRY II. BLADES.

Witnesses:

W. H. CHAMBERLIN, W.- W. LEGG-ETT.

